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....can_zero = nbdplug_can_zero, + .can_fast_zero = nbdplug_can_fast_zero, .can_fua = nbdplug_can_fua, .can_multi_conn = nbdplug_can_multi_conn, .can_extents = nbdplug_can_extents, diff --git a/plugins/null/null.c b/plugins/null/null.c index 647624ba..559cb815 100644 --- a/plugins/null/null.c +++ b/plugins/null/null.c @@ -100,6 +100,13 @@ null_can_cache (void *handle) return NBDKIT_CACHE_NATIVE; } +/* Fast zero. */ +static int +null_can_fast_zero (void *handle) +{ + return 1; +} + /* Read data. */ static int null_pread (void *handle, void *buf,...

This is a cover letter to a series of patches being proposed in tandem to four different projects: - nbd: Document a new NBD_CMD_FLAG_FAST_ZERO command flag - qemu: Implement the flag for both clients and server - libnbd: Implement the flag for clients - nbdkit: Implement the flag for servers, including the nbd passthrough client If you want to test the patches together, I've pushed a